ML20140F821
| ML20140F821 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/13/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8507120216 | |
| Download: ML20140F821 (2) | |
Text
o
~
~
TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 37401 1630 Chestnut Street Tower II June 13, 1985 a,
BLRD-50-438/82-14 g
BLRD-50-439/82-14
-l U.S. Nuclear Regulatory Commission Region II a
Attn:
Dr. J. Nelson Grace, Regional Administrator 63 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 ww
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - IMPROPER USE OF FOAM PLASTIC INSULATION ON STAINLESS STEEL PIPE '- BLRD-50-438/82-14, BLRD-50-439/82 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector R..V. Crlenjak on February 3, 1982 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8203 This was followed by our interim reports dated March 5, June 1, September 7 and December 10, 1982 and March 21 and September 15, 1983 and October 22, 1984. Enclosed is our final report.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY J..a W. Hufham, Manager
. Licensing and Regulations Enclosure
- co :
Mr. James Taylor, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 g#,kb h
[
s
[Lf An Equal Opportunity Ernployer
~
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 IMPROPER USE OF FOAM PLASTIC INSULATION ON STAINLESS STEEL PIPE NCR BLN BLP 8203 BLRD-50-438/82-14, BLRD-50-439/82-14 10 CFR 50.55(e)
FINAL REPORI Description of Deficiency During the process of a design review, a deficiency was discovered in the us of foam plastic insulation on stainless steel pipe. Foam plastic insulation cannot be purchased to meet the requirements for chloride and fluoride content for use on stainless steel pipe as defined in Regulatory Guide 1.36.
The deficiency resulted from the use of two instructional documents by designers which specify foam plastic insulation to be used on cold water piping without regard for potential adverse effects on stainless steel.
The designers used these documents in preparing pipe insulation drawings, seismic analysis modes, and pipe insulation procurement drawings.
Accordingly, some drawings were released which incorrectly specified the foam plastic insulation on stainless steel pipe. Nonconformance report (NCR) WBN MEB 8436 (WBRD-50-390/84-46 and WBRD-50-391/84-41) has been written documenting a similar condition at Watts Bar Nuclear Plant (WBN) and is being separately reported to the NRC under 10 CFR 50.55(e).
j Safety Implications Use of the foam plastic insulation on safety-related stainless steel piping could result in leaching of chloride and fluorides onto the piping and subsequent stress corrosion cracking, thereby adversely affecting the safe operation of the plant.
Corrective Action TVA has removed all foam plastic insulation from stainless steel pipe at Bellefonte Nuclear Plant (BLN). As noted in our previous reports, TVA's instructional memorandum denoting the types of insulation compatible with Regulatory Guide 1.36 has been revised to preclude future specification of foam plastic insulation on stainless steel pipe; a similar revision to DG-M18.9.1 has also been issued.
The seismic analyses and support data sheets necessary to reflect the change in type of insulation have also been revised and reissued. No support changes were required; consequently, all design and construction activities required to disposition this nonconformance are complete.
1 f
_